Release next major version

[Dumluregn]

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Due to bumping the version of ckeditor4-integrations-common package done in #207, the next package version should be a major one (see the explanation in #201). Also, as mentioned in #202 (review), we may end up dropping the support for Angular 5, which is another factor forcing us to release 3.0.0. It would be nice to schedule those changes together with bumping the CKEditor 4 version (probably to 4.16.2).

If we indeed drop support for Angular 5, there is a number of mentions we need to update:

• Docs guide for Angular integration
• README file in this repo
• npm page

There is actually one more event coming that will probably force us to release yet another major version - Angular dropping support for IE11 (see #196 for more details). However Angular 13 should be released no earlier than in 4 months, so maybe we should wait with the major release until then and for now keep the ckeditor4-integrations-common in version 0.2.0.

[Dumluregn]

For now we agreed on the following release schedule:

• Once Introduce Angular tester #202 is merged, we drop official support for Angular 5 (due to difficulties in testing it). As we've already did Upgrade ckeditor4-integrations-common #201, we release a new major version then.
• When Angular 13 (dropping IE11 support) is out, we should check if built ckeditor4-angular package is still compatible with IE11. It may turn out that we don't have to change anything and it still works for older Angular versions. In such a scenario we don't have to release next major version. If Angular 13 substantially changes build process and package won't be compatible with IE11, we should release another major version.
• In the meantime we'll release minor versions and patches bumping the ckeditor4 URL.

[xinpingwang]

Is there any plan to release the next version, I notice ckeditor4-integrations-common 1.0 has remove the dependence of load-script, and I want the version without load-script. Thanks 😀.